Causes and ideologies, not religions, kill people (religions are subcategory of those) yet they're some and most important things in human lives. World without causes is empty, shallow. But they're source of great atrocities too.
What people need is really start communicating, broaden their views, open their minds. Acceptance, forgiveness, something that aims in greater things than benefits of individuals, nations and organizations. Start using their brains, ask questions, seek answers, doubt things. Above all start searching, it's journey that matters, not the journey. Most people just eat, have sex, sleep, work and die away without greater understanding or searching it.
...Yeah, I get these idealistic outbursts once in a while.